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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Insurance [Abstract]    
Balance at beginning of period $ 472,829 $ 248,425
Less: Reinsurance recoverable (393,365) (182,405)
Net balance at beginning of period 79,464 66,020
Incurred (recovered) related to current year 113,279 75,970
Incurred (recovered) related to prior years (185) (44)
Total incurred 113,094 75,926
Paid related to Current year 34,549 17,407
Paid related to Prior years 60,724 65,253
Total paid 95,273 82,660
Net balance at end of period 97,285 59,286
Plus: Reinsurance recoverable (269,071) (70,351)
Balance at end of period $ 366,356 $ 129,637